““The New York Times - Daily Edition for Kindle (The New York Times Company) - Clip This Article on Location 970 | Added on Sunday, September 21, 2014 10:35:40 AM Many Veterans Adapt to a Strange World, One With Walls By DAVE PHILIPPS LOS ANGELES — For 30 years after Vietnam, Art Harmon’s address was a dry wash under the 210 freeway, where he tried to forget his tour as a 19-year-old helicopter gunner. “I couldn’t be around human beings anymore,” he said. “I didn’t feel at home anywhere.” Today Mr. Harmon has a one-bedroom apartment in nearby Sun Valley, thanks to what is being described as the largest campaign in history to stamp out homelessness among military veterans, who have constituted as much as a quarter of the nation’s homeless population. Since 2010, the Obama administration has spent $4 billion hiring thousands of staff workers, expanding social services and medical programs, and renting thousands of apartments, seeking to fulfill a pledge by Eric Shinseki, the former secretary of Veterans Affairs, to end veterans’ homelessness by the end””